Pendulum.



No. 842,15 7 PATENTED JAN. 22, 1907. A. w. BARNARD.

PENDULUM.

APPLICATION FILED AUG.21,1905.

and in this way I am enabled to take full advantage of the shifting of the center of gravity of the pendulum due to the flowing of the mercury when the pendulum is swung.

As the amount of change in the position of the center of gravity or" the pendulum during its oscillation is att'ected by the position of the cylinder with respect to the pendulumrod as regards both horizontal and angular adjustment, the precise arrangement must be.

determined by adjustment of the parts and testing.

In Fig. 4 is illustrated the method of applying my invention to one form of scale, to which use it is particularly adapted. There the ordinary term of pendulum is used in a 1 scale to offset the load on the scale-beam, weight is indicated upon a dial by a pointer operated by the pendulum, and as the latter moves in steps'of varying length it is necessary to graduate the dial to correspond. In the use of my pendulum, however, the dial may be marked in equal divisions, since the pendulum always moves the same distance to denote a unit oi weight irrespective of the portion of it s are of oscillation in which it may happen to be. This fact oi course simplifies the preparation and arrangement of dials and saves time and labor in the manufacturing process and at the same tifue tends to increase the accuracy of i he scale.

The scale shown in Fig. 4 comprises a scale-beam 20, fulcrumed at 21 on a support 22, which springs from abase portion 25, and a scoop 26 on a standard 27, pivotally supported at 28 upon said beam. The base Slipports' a casing consisting of body portion 30, provided with an extension 31, and a housing 32, which exposes a dial 35 appropriately marked. On the outer end of the scalebeatn 20 is an equalizing-weight 38, and between the pan and the casing is a sliding or tare weight 39. The inner end ol the scalebean 20 is connected by a rod 40 to an arm 41, fixedly attached to an arbor or spindle 42, mounted on knife-edge hearings in the body portion of the casing. Depending from the arbor and iixedly :rounted thereon is my pendulum. The latter is so adjusted with reference to the scale-beam 20 through arm 41 and rod40 that when the scale-beam is in a horizontal and evenlyl' alanced position the pendulum hangs normal y vertical. Also upon the arbor 42 is fixedly mounted a hand or pointer 45, which turns with the arbor and pendulum and is so 'adjusted with reference to the latter that it is at zero on the dial 35 when the pendulum is vertical. 50 represents a dash-pot device of any construction which serves to reduce the oscillations of the scale-beam.

When inuse, the operation is the same as in an ordinary pendulum-scale, with the exception that my pendulum to denote, for instance, pounds in weight will move an equal space for each pound, and therefore will turn the hand 45 an equal space upon the dial 35 for each unit in weight.

What I claim is 1. In a pendulum, the combination of a stem and a hollow receptacle adapted to contain mercury or other suitable liquid; said receptacle being mounted on, and transversely adjustable in relation to, said. stem.

2. In a pendulum, the combination of a stem and a hollow cylinder transversely adjustable in relation to said stem and pivotally mounted on the lower end of said stem; said cylinder being adapted to contain mercury or other suitable liquid.

3. In a pendulum, the combinationof a stem and a hollow receptacle transversely adjustable in relation to said stem and pivotally mounted on the lower end of said stem.

.4. In a pendulum, the combination of a stem, a hollow receptacle mounted on the lower end of said stem and adapted to con-v tain rercury or other liquid and means to adjust said receptacle horizontally.

5. In a pendulum, the combination of astern, a hollow receptacle pivotally mounted on the lower end of said stem and neans for adjusting said receptacle horizontally.

6. In a pendrlum, the combination. of a stem, a yoke pivotally mounted on the lower end of said stern, a hollow cylinder supported by said yoke, and means for adjusting said. cylinder horizontally.

7. In a pendulum, the combination of a stem, a yoke pivotally mounted on the lower end of said stem, and provided with bands, a hollow cylinder held in said bands and 1r eans whereby said cylinder nay be adjusted horizontally in relation to said stem.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses, this 14th day of August, 1905.

ARTHUR W. BARNARP.

Witnesses:

L. P. SLADE', A. i. GAWFIRD. 

